Measuring-pump for oil and the like.



B. DAVIS. MEASURING PUMP FOROH; AND THE LIKE;

' APPLICATION FILED JULY 17,1916. 1,275,866.

. Patented Au ls, 1918 3 SHEETS-SHEET}.

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J. B. DAVIS.

v MEASURING PUMP FOR O-II. AND THE LIKE.-

' APPLICATION FILED JULY 17,1316- 1,275,866.- ramming. 13, 1918.

3 SHEEITS-SHEET 2;-

A TTORNE YS.

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I W flag $222124 15W Z/ 4 J. B. DAVIS;

MEASURING PUMP FOR OIL AND THE LIKE.

APPLICATION FILED JULY 11.1916.

l,275,866. I Patelilted Aug. 13, 1918.

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Application filed J'uly 17,1916. Serial No.109,834.

" STATES PAT N o IoE.

101m B. DAVIS, 01 SPRINGFIELD, MASSACHUSETTS, ASSIGNoE To GILBERT &'BA3KER MANUFAQTUBING COMPANY, oEw'EST SPRINGFIELD, MASSACHUSETTS, A GORPO-:

RAT O}: OF MAS AC USE TS.

ME S E NG-PUMPEQR oIL AND THE LIKE.

. To all whom it may concern: 5 Be it known that I, J OHN B. DAVIS, a citizen of the United States of America, re-

siding in Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improve- 'ments in Measuring-Pumps fc r Oil and the like, of which the following is a specification.

'.This invention relates to improvements in dispensing or measuring pumps, such as are commonly usedain the dispensation of gasolene and like oils.

Such pumps are generally of the piston type, which has been found to be most satis- 1 factory on account of itsaccurate measi'iring qualities. Moreover, these pumps are com-- monly single acting pumps, and the ,pistons thereof are arranged for reciprocation by a rack and pinion device- Theprincipal disad vantages incident to such construction 'are twofold, namely, intermittent flow, since the pump delivers'on one stroke only, and inconvenlent operation, since the pinion is usually actuated by a crank which must be turned first in one and then in the opposite direction. This invention is concerned with 'the elimination of these disadvantages in an improved manner and more particularly with a simple structural addition to single acting piston pumps whereby the flow therefrom may. be rendered COI1tiI11lOUS.

This structural addition takes, the form of a small cylinder and apis'ton secured to the piston rod of the main piston and slidable within the small cylinder. Such additional cylinders have been used before, as I am aware, but the structure hereinafter dis-,

closed has certain novel and advantageous features over the prior art. For example: heretofore the additional cylinder has been either entirely closed in or left entirely open to the airwith the disadvantage in one case of 'a back pressure on the small piston or in theother case of a possibility of injury to the walls of the smallcylinder and piston through dirt, grit, and other foreign sub stances lodging in the cylinder through its open upper end. This invention seeks to eliminate both the disadvantages mentioned. Anobject oi this im'ention is to provide in a snigleacting piston pump, a primary cylinder adapted. to receive liquid from a Specification of Letters Patent. Patented Aug, 13, 1918.

' within the primary and secondary cylinders, together with a connection between the up-' per portion of the secondary cylinder and the air space of the supply tank, the secondary cylinder-being closed at its upper end, whereby foreign substances are prevented from lodging therein, the construct-ion being characterized by a surging 01 fluid, preferably air, to and from the upper portion of the secondary cylinder whereby back pressure on" the secondary piston is eliminated. A

Another object of the invention is to provide in a'pump of the class described improved means to reciprocate the pistons, said means arranged for operation by continuous rotation 1n one direction and characterlzed I by an'improved arrangement for varying the stroke of the pistons.

Another object of the invention is to provide an mproved measuring pump, adapted to deliver a definite measuredquantity for each revolution of the operating means, together with apparatus to count and register said revolutions and thusindicate the measured quantifiesdispensed. 1

Other ob 'ects and advantages will appear ill the detailed description to follow and in the appended claims.

For the pi-irpose of 'llustrating one way in which the/invention may be practised, a s1n1 gle preferred embodiment thereof is shown in the accompanying drawings, in which Figurel is an elevational view, with parts in section, of the dispensing and'measuring is a sectional elevation drawn to an on the line 4-4 of Fig. 3 and looking in a the direction of the arrows;

Fig.5 is an enlarged sectional view taken on the line 5-5 of Fig. 3 and looking in the direction of the arrows;

Fig. 6 is a sectional view taken on the the latter being indicated in Fig. 3.

line 66 of Fig. 3 and looking in the direction of the arrows;

Fig. 7 is a sectional plan view taken on the line 7-7 of Fig. 3 and looking in the direction of the arrows; and

Fig. 8 is a diagra-mmatical view of the ope iting mechanism for the piston rod.

Referring to these drawings in detail, the

frame ofthe pump comprises a pedestal A."

which forms a housing for the pump cylinders, a casting B which closes the top of pedestal A and forms a support for the pump cylinders, and a substantially ll-shaped yoke C mounted upon plate B with the-cross bar of the U in spaced relation above the latter. \Vithinyoke (J and above plate B is located the pump operating mechanism and the counting and registering apparatus to be described. It desirable, doors D may be mounted on yoke C to inclose the apparatus housed therein, as clearly shown in Figs. 3 and 7.

The pump cylinders and associated devices will first be described. The casting B formed with axially alined sockets 1 and 2 to receive sleeves 3 and 1, which constitute secondary and primary cylinders respectively, and the sockets, as shown in Figs. 1 and 2, extend above and below plate B, respectively. Sleeve 3 has a relatively large bearing in socket 1 and is held therein by adriving fit so that it depends into the lower .socket 2 spaced therefrom andin concentrical relation. The lower end of sleeve & is closed by a. cap 5, and the latter isheld to plat-e13 by suitable tie rods 10, portions of Cap 5 has a central chamber 6 which is in com- ;munication with a supply pipe 7, and the outlet of chamber 6 is normally closed by a suction operated valve 3. Above the latter is asuitable filter 9 which supported upon the upper face of cap 5, 1 and 2.

as shown in Figs.

Slidably mounted in. sleeves 3 and 4: are

pistons'll and 12, respectively, which are i which strip also forms the packing for the piston. The upper piston 11 is similar, but the apertures are omitted, and it simply has the spring pressed strip to prevent leakage past the piston. The socket 1 is closed at the top, as shown in Figs. 1 and 2, and the space above piston 11 is adapted to be 0011- nected to the air space of the tank which supplies pipe 7 by a pipe 16;, a cored passage in member B (Fig. 2) 'and a small orifice 16 in sleeve 3. Thus, the space above piston 11 is adapted to be filled at all times with air which surges back and forth between the space in sleeve 3 and the supply tank. It is important to note that any liquid which may pass by piston 11 into the space in sleeve 3 thereabove is redelivered to the supply tank by pipe 16. It has been found that, in practice, a slight leakage occurs which is caused b 1 slow see 39.01: of the thud throu h the b c: packing strip 15. It is also to be noted that upperend of its stroke when thepump is idle to prevent loss of the charge in the lower part of the sleeve 3, so that the accuracy ota subsequent delivery from the pump will be unaffected. chamber 17 therein which. extends around or'of sleeve 3, and leading vertird from chamber 17 on opposite sides oi; sleeve 3 are pipes 13 and 19 which are delivery and expansion pipes, respectively. Preferably, a suitable nonreturn valve 18 is interposed in the delivery pipe which is arranged to prevent the entrance of air to the cylinders. The lower cap 5 has an annular cored chamber 20 into which all sediment and water, held from passing into the pump by filter 9, is adapted to pass, and a small pipe 21, in communication with this chamber, extends vertically upward through plate B and is provided at its upper end.

with a valve 22. The latter is provided for the purpose of blowing off the filter, when desired. This is accomplished by closing off delivery pipe 18, opening valve 22, and thereafter operating the pump, whereby the water and sediment in chamber 20 will be forced through pipe 21.

The operating mechanism for the pump.

Will next be described with particular reference to Figs. 3 to 3, inclusive. Piston rod 13 extends entirely through yoke C and is concealed by an o namental cap 2st which permits the requisite travel. of rod 13 therein. Coiled around rod 13 and held between a collar on the latter and the upper face of yoke C is a spring A similar spring 26 is supported below yoke C on 'a collar pinned to rod -C, as bestshown in Fig. 3. These springs are arranged to be alternately compressed against yoke C as rod 13 nears its dead center positions with the idea of preventing the jump experienced when, as here, the rod is reciprocated by a crank handle, continuously rotatable in one direction. By thus. providing some resistance, where otherwise little exists, the resistance Socket 2 has a deliveryd 42 and pinned thereon is a cam 43 and a to turning of the operating handle is made substantially uniform.

Fixed to yoke C, as shown in Fig. 7, is I.

pinned to the latter is a crank 28 Whichis connected by a link 29 to rod 13 by a suitable clamp, as shown in Figs. 3 and 8. Loosely mounted on shaft 27 and held from axial movement by .the collar shown is a crank handle 30, the interior construction of which is illustrated in Fig. 5. Pivotedin handle 30 is a pawl 31 normally held in engagement with the shaft 27 by the spring shown. A pin- 32 is driven diametrically through shaft 27 and its protruding-ends are filed off to form ratchet teeth. \Vhen handle 30 is rotated in the direction of the arrow,.

shown in Fig. 5, shaft 27 is rotated, and

the pawl and ratchet construction permits and has rounded ends to engage the ex-' tremities of the latter, as shown in Fig. 4. The outer end of screw has a square hole 38 therein adapted to. receive a socket wrench which may be inserted in the opening 39 in the end of crank 28. A small hole 40'permits a wire to be passed therethrough and diametrically across opening 39 and, if desired, the ends of this wire may be brought together and sealed, to prevent its removal whereby fraudulent change of adjustment and the subsequent deliveries of inaccu rately measured quantities may be prevented.

The counting and .registering apparatus will now be described with particular reference to Figs. 3,- 6, and 7. Rotatably mounted in a cross bar E fixed to yoke C is a shaft slotted operating crank 44. A rod 45 fixed in link 29 is suitably bent so that its extremity lies exactly opposite crank pin 34 and so that it clears piston rod 13 at all points in its rotation. The extremity of rod 45 lies in the slot in crank 44, as shown in Fig. 6, so that bar E andf'the mechanism thereon may be quickly and conveniently connected or detached without disturbing the operating mechanism. E by screws 46 (Fig 6) is a ring casting 47 (Fig. 3 having an outer flange spaced from the plate. A dial ring 48 and a ratchet 49 held together by screws 50 (Fig. 3) are r9- tatable upon the periphery of .ring 47 and are held axially between the flange on the latter and plate E. Pivoted intermediate A slot 33 therein receives the Fixed to plateitsends at 51 to plate E (Fig.6) is a lever 52, the lower end of which is held against cam- 43 by a spring 53. Extending through the upper end of lever 52 'is a pin 54 having a head thereon at one end to rest against the lever, as 'shown in Fig. 3, and a pawl 55 pinnedthereto'at the. other end. Passing loosely through the head of pin 54 (Figs.

3 and 6) is a spring. 56 which is secured to lever 52, as shown in Fig. 6. This spring is arranged to hold pawl 55 in engagement with ratchet 4S) and, when the pawl is moved, pin 54 moves .therewith and bends spring 56. A holding pawl 57 is similarly mounted in plate E, as shown in Fig. 6.

It will be obvious from the foregoing description that one complete revolution of handle 30 will move ratchet 49 the distance of one tooth andthe rim 48 as well. The latter has fixed thereon a face dial 6() (Fig; 1) and a peripheral dial 61 (Fig. 7)-. Both dials are graduated in suitable units, such as gallons, for example, and the indications of these dials may be read by reference to pointers 62 and 63, respectively, which are fixed to plate E, as shown in Figs. 1, 3, and 7. Fixed to plate E and arranged centrally within the opening in ring 47 is a total register 64 which is of the usual construction and well known by those skilled in the art. This register is adapted to be actuated from a small crank 65 fixed to the end of shaft 42. as shown in Fig. 3. The readings of total quantity delivered from the pump for any period. Dials 60 and (31, however, are.

adapted to indicate merelythe quantity dispensed to one customer and are arranged to be reset by turning the rim 48 in a counterclockwise direction until the zero marks lie in under the pointers. A pin 66 (Figs.

1, 3, and 7) is fixed to rim 48 to permit convenient turning thereof for resetting purposes. It is to be noted that dial 60 is so arranged as to be conveniently visible to the customer while dial 61 and register 64 are arranged for convenient reading by the pump operator. y The dials just described are arranged to count the revolutions of'handle 30,- each of the smallest scale divisions representing one revolution. The pump itself is first adjusted by screw 35 to deliver the. desired quantity per revolution, sayffor example, one quarter of a gallon. Havmg made this pre-v liminary ad ustment, the readings of dials 60 and 61 will indicate gallons and fractions thereof as four revolutions of ratchet 49 will bring the numerals 1 on dials 60 and 61 in under their respective pointers 62'and 63. The variable throw crank 28 may be, if desired, moved ,so that one revolution of crank 30 effects the delivery of one quarter. of a Canadian gallon, or, if desired, a liter, In the latter instance, new dials would, how

ever, be provided which are similarly graduated but have different designations for more convenient reading.

The operation of the pump will now be described with reference .to Figs. 1 and 2, With the parts positioned as in Fig. 2 an upward stroke of piston 12 will create a partial vacuum, lift valve 8 from its seat, and draw in a charge of liquid from pipe 7. Upon a succeeding down stroke, valve 8 is forced to its seat, and the liquid is forced through openings 14- and past strip 15 into the upper portion of sleeve The next up stroke of piston 12 will force liquid 'hrough delivery pipe 18 but not, however, ll the charge drawn in for pistons 11 and 42 move together and part, approximately half, of the charge, passes into sleeve 3, as piston 11 recedes, to be delivered through pipe 18 on the down stroke of piston 11.. The expansion pipe 19 is arranged to act in the well known manner as an air dome and assists with the piston 11 and sleeve 3 n mak ng the flow through pipe 13 sub- .ifill'l'tlzzllj/ uniform and continuous. Thus, by the addition of piston 11 and sleeve 3 to a singi acting pun'ip, the flow therefrom is made c rlllllOllS as the operating handle 18 continuously turned in one direction.

it is not desirable to have cylinder 3 open to the air as has been done heretofore for such construction permits dust, dirt. and foreign substances to collect therein, which substances are in time ground between the piston 11 and its cylinder to the detriment of both. Neither is it desirable to have the cylinder 3 closed in the ordinary manner for the reason that an undesirable back pres. sure is then encountered by piston ll. The important feature of the constrrwtioi "ark-- ing as described is that the cylinder 3 is closed at the top without having the usual undesirable back pressure, for the space above piston 11 is filled with fiuid which surges back and forth in pipe 16. Thus on the dpwn stroke of rod 13 piston 12 is forcing its way through the liquid drawn into, sleeve at on the preceding stroke and piston 11 is drawingin a charge of air from the supply tank which chargeis redelivered to the tank on the succeeding stroke.

Thus, by the simple addition of cylinder 3 to a single acting pump in the manner disclosed, a continuous delivery may be secured therefrom and the particular arrangement is characterized by its reduction of back pressure on, and by its-prevention of damage by foreign substances to, the additional cylinder. It is recognized that modifications may be made in the specific structure herein described for illustrative purposes Without departing from the scope of the invention which is defined by the appended claims rather than by the foregoing description of one preferred form.

V/hat I claim is 1. The combination with a main piston pump of a. secondary cylinder communicating at one end with the pump cylinder and arranged to receive part of the lifted charge for delivery on the return stroke of the pump, a secondary piston slidable in the sec ondary cylinder and movable with the pump piston, the other end of the secondary cylinder being entirely closed to the atmosphere,

and means for connecting the upper portion of the secondary cylinder to a fluid supply chamber, all constructed and arranged so that fluid may surge back and forth from the upper portion of the secondary cylinder through said connecting means.

' 2. The combination with a main piston pump operable to deliver liquid from a sup ply tank, of a secondary cylinder communicating at one end with the pump cylinder and arranged to receive part of the lifted charge for delivery on the return stroke of the pump, a secondary piston slid'able in the secondary cylinder and movable with the pump piston, the secondary cylinder having its other end entirely closed to the atmosphere, and means adapted to connect the upper portion of the secondary cylinder to the air space of the supply tank, all constructed and arranged so that air may surge back and forth from the upper portion of the secondary cylinder through said connect ing means.

3. l lie combination in a measuring pump with a piston rod thereof, spaced supports between which said rod is arranged to travel, a crank-shaft rotatable in one of said supports, a link connecting the crank-shaft and rod to reciprocate the latter on rotation of the crank-shaft, a counting apparatus mounted on the other support, and an actuating member for the apparatus, said member connected to said link and bent in U; form to clear said rod.

4:. The combination in a measuring pump with the piston rod thereof, spaced supports between which said rod is arranged to travel, a pump-actuating shaft rotatable in one of the supports, a register-operating shaft alined with the actuating shaft and rotatable in the other support, crankson each shaft, means to connect said cranks one to the other and to said rod so that a rotation of one will reciprocate said rod and will rotate the other shaft without interfering with the reciprocatory movement of said. rod.

5. The combination in a double-acting measuring pump with the pistons and a common piston rod therefor, of a crank-shaft operatively connected to the rod'to reciprocate the latter on continuous rotation of said shaft in one direction, a frame supporting said shaft and having a part through which said rod is arranged to pass, a crank handle to turn said shaft, abutments on said rod one on each side of said part, and a spring between each abutment and said part, each spring arranged to be compressed between its abutment and said'part only as the piston approaches a dead center position and to eXertVa gradually increasing and then a gradually decreasing resistance as the piston moves toward and away from a dead center position whereby said handle may turn smoothly under a substantially constant effort throughout a cycle of operation of the piston.

' 6. A measuring pump comprising, a hollow pedestal, a cover plate therefor, pump cylinders supported by and depending from the latter, a commonrpiston rod'for the cylinders extending above said plate, a U- shaped yoke supported from, the latter having a central bearingfor said rod, a crank shaft supported from the yoke on one side of said rod, and a link connecting the latter to the crank shaft, whereby the rod may be reciprocated on a rotation of said shaft, a counting apparatus supported from the yoke on the other side of said rod, and an actuating member therefor connected to the link and bent in U-form to clear said rod.

7. A pump, comprising, axially alined" cylinders of different diameters, one thereof having an upper end closed to the atmos phere and arranged within the other cylinder at the outlet end thereof, a cap at the base of the larger cylinder having a valve controlled inlettherein adapted to be connected to a liquid supply tank, valved and valveless pistons slidable respectively in the large and small cylinders, a common piston from the upper portion of the secondary cylinder through said connecting means.

,JoHr B. DAVIS. 

